CN112472080B

CN112472080B - Blood sampling device with needle unloading pause and cap pricking convenience

Info

Publication number: CN112472080B
Application number: CN202011131208.9A
Authority: CN
Inventors: 施国平; 王祥生; 张金权
Original assignee: Sterilance Medical Suzhou Inc
Current assignee: Sterilance Medical Suzhou Inc
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2022-11-22
Anticipated expiration: 2040-10-21
Also published as: CN112472080A

Abstract

The utility model provides an unload needle and pause blood sampling device of being convenient for prick cap, comprises disposable blood taking needle and supporting and repeatedly usable's blood sampling pen, and the blood taking needle comprises needle handle and needle cap, and the blood sampling pen is including penetrating the pole and unloading the needle bar, its characterized in that: between the sliding matching surfaces of the needle handle and the needle base, one is provided with a first clamping groove and a second clamping groove, and the other is provided with a clamping hook. When the clamping hook is in clamping fit with the first clamping groove, the needle handle is in an installation locking position relative to the needle base, and when the clamping hook is in clamping fit with the second clamping groove, the needle handle is in a needle unloading stopping position relative to the needle base. The needle unloading pause position is specially designed during needle unloading, and the temporary pause ensures that the needle tip and the needle handle head are exposed from the blood sampling end face in the needle unloading process, and provides a stable temporary state, thereby being beneficial to realizing reliable cap pricking operation. Therefore, the invention solves the problems of poor operation stability and inconvenient operation of needle-removing and pricking caps of cap-removing-free blood sampling pens.

Description

Blood sampling device with needle unloading pause and cap pricking convenience

Technical Field

The invention relates to a medical blood sampling apparatus, in particular to a blood sampling device matched with a disposable blood sampling needle. The invention is particularly suitable for disposable blood taking needles and cap-removal-free needle-mounting and needle-dismounting blood taking pens matched with the disposable blood taking needles, and is convenient for cap pricking operation due to obvious pause generated during needle dismounting.

Background

The blood taking pen is a blood taking apparatus matched with a disposable blood taking needle for use, wherein the blood taking pen can be repeatedly used, and the blood taking needle is only used once to avoid cross infection. In the prior art, the blood sampling pen has two types of cap-removal-free type and cap-removal type from the viewpoint of convenience of needle assembly and disassembly. The cap-removal-free blood sampling pen does not need to remove the pen cap when a needle is installed, a blood sampling needle is directly inserted into the needle base of the injection rod through the large hole in the front end of the pen cap, and the blood sampling needle can be directly removed from the large hole in the front end of the pen cap when the needle is removed. When the cap-dismounting type blood sampling pen is used for assembling a needle, the pen cap must be firstly dismounted, then the blood sampling needle can be inserted on the needle base of the injection rod, and when the needle is dismounted, the pen cap must be firstly dismounted, and then the blood sampling needle can be dismounted. From the convenience of use and operation, the cap-free blood sampling pen is obviously superior to the cap-free blood sampling pen. Along with the continuous development of blood sampling pen technology, the cap-removal-free blood sampling pen is gradually a new popular development trend due to simpler and more convenient operation.

The Chinese patent CN109512437A discloses an invention patent application with the application number of 201811548142.6 and the name of 'cap-detaching-free needle-assembling and disassembling blood sampling pen' on 26.3.2019. The cap-removal-free blood sampling pen is provided with the large hole through which the blood sampling needle can directly penetrate on the pen cap, so that the blood sampling needle can be removed without opening the pen cap.

In the field of blood sampling pens, after a disposable blood sampling needle is used, the needle tip of the blood sampling needle can be discarded after being pricked into a needle cap so as to avoid pricking others or causing cross infection, which is a safety requirement for the use of the blood sampling pen. However, for the cap-removing type blood sampling pen, the head and the needle tip of the blood sampling needle can be directly observed due to the fact that the pen cap needs to be removed when the needle is removed, then the needle tip of the blood sampling needle is pricked into the needle cap through manual operation, and finally the blood sampling needle is removed through the needle removing rod. However, in the cap-removal-free type blood sampling pen, since the head and the needle tip of the blood sampling needle cannot be directly observed without removing the pen cap during needle removal, the operation of inserting the needle tip of the blood sampling needle into the needle cap is inconvenient. Particularly, for the blood sampling pen with the rear puncture depth adjusting structure, the blood sampling needle and the needle seat have higher clamping and positioning requirements in the axial direction of the blood sampling pen, so that inconvenience is brought to needle removal, particularly to the pricking of the blood sampling needle. The conventional cap-removal-free blood sampling pen is not provided with a needle removal stopping mechanism, and the operation is usually carried out by firstly pushing a blood sampling needle for a certain distance through a needle removal rod according to experience, so that a needle tip is exposed out of a pen cap and then pricked into the needle cap, and finally the blood sampling needle is pushed out of the blood sampling pen. The needle-removing operation is not easy to master and control on one hand, and on the other hand, once the needle tip of the blood taking needle is not operated improperly, the blood taking needle is pushed out of the blood taking pen before the needle tip is inserted into the needle cap.

In order to solve the problem, the Chinese patent CN111419240A discloses an invention patent application with the application number of 202010315934.X, namely a blood sampling pen convenient for needle removal and cap prick in the 17 th month in 2020. According to the needle discharging device, under the needle discharging state, the elastic bump is interfered with the blocking surface along with the forward movement of the needle discharging rod relative to the shooting rod, the needle discharging rod is forced to move forward relative to the shooting rod to generate pause, the blood taking needle is separated from the original position at the moment, and the needle tip is exposed from the blood taking end face to facilitate the cap pricking. The proposal solves the problem of inconvenient operation caused by no cap pricking pause and limited observation needle tip when the needle is unloaded in the existing cap-free blood sampling pen.

The invention aims to adopt another scheme to solve the problem that the cap-dismounting-free blood sampling pen needs to dismount the needle and stop to facilitate cap pricking when the needle is dismounted.

Disclosure of Invention

The invention provides a blood sampling device convenient for cap pricking during needle unloading pause, and aims to solve the problem that the cap pricking is convenient due to the needle unloading pause when a needle of a cap-free blood sampling pen is unloaded by adopting another scheme.

In order to achieve the purpose, the invention adopts the technical scheme that: a blood sampling device with a conveniently-pricked cap during needle unloading pause is composed of a disposable blood sampling needle and a matched reusable blood sampling pen.

The blood taking needle consists of a needle handle and a needle cap.

The blood sampling pen comprises a shooting rod and a needle unloading rod. The ejection rod is an ejection part of the blood sampling pen and is arranged in an ejection cavity of the blood sampling pen, and the head of the ejection rod is provided with a needle seat for inserting a needle handle of the blood sampling pen. The needle unloading rod is a needle unloading part of the blood sampling pen, the needle unloading rod is in axial sliding fit relative to the shooting rod, a needle unloading action surface is arranged on the needle unloading rod, and the needle unloading action surface is used for pushing and unloading a needle handle arranged on the needle base.

The innovation lies in that: between the sliding matching surfaces of the needle handle and the needle base, one is provided with a first clamping groove and a second clamping groove, the other is provided with a clamping hook, and the action parts of the first clamping groove, the second clamping groove and the clamping hook are positioned on the same axial sliding path.

The hook is provided with a hook surface special for clamping, a first clamping surface is arranged in the first clamping groove corresponding to the hook surface, and a second clamping surface is arranged in the second clamping groove corresponding to the hook surface.

When the clamping hook is clamped and matched with the first clamping groove, the needle handle is in an installation and locking position relative to the needle base, and in the installation and locking position, the radial projection length of the overlapping area of the hook surface and the first clamping surface on the cross section of the needle handle is a first clamping amount.

When the clamping hook is in clamping fit with the second clamping groove, the needle handle is located at a needle unloading stopping position relative to the needle base, and the radial projection length of the overlapping area of the hook surface and the second clamping surface on the cross section of the needle handle is a second clamping amount at the needle unloading stopping position.

The first engagement amount is smaller than or larger than the second engagement amount.

In the needle unloading state, the needle unloading process is in the following three stages:

in the first stage, the needle unloading rod is pushed manually, the needle unloading action surface on the needle unloading rod acts on the needle handle, and the clamping hook is clamped and matched with the first clamping groove because the needle handle is in an installation locking position relative to the needle base, so that the needle handle and the shooting rod are driven to move forwards integrally until the shooting rod stops moving forwards when being in a front end limiting position relative to the blood sampling pen.

And in the second stage, the needle discharging rod is continuously pushed, the shooting rod cannot continuously move forwards due to the fact that the shooting rod is located at the front end limiting position, so that the clamping hook is forced to be unhooked from the first clamping groove, the needle discharging rod pushes the needle handle to move forwards on the needle base after unhooking, when the needle handle moves to the needle discharging pause position relative to the needle base, the clamping hook is clamped and matched with the second clamping groove, meanwhile, the needle handle moves forwards on the needle base to pause, the needle handle moves forwards on the needle base for a certain distance after being separated from the installation locking position, and the head and the needle tip of the needle handle are exposed out of the front end of the blood sampling pen to facilitate cap pricking.

And in the third stage, the needle unloading rod is pushed continuously after the cap is pricked, and the shooting rod cannot move continuously because of being positioned at the front end limiting position, so that the clamping hook is forced to be unhooked from the second clamping groove, and the needle handle is ejected out of the needle seat by the needle unloading action surface on the needle unloading rod after unhooking.

The invention is explained below:

1. in the scheme, the blood taking needles are generally divided into two types, one type is a twist cap type blood taking needle, and the other type is a cap type blood collecting type. The cap-turning type or cap-covering type blood taking needle consists of a needle handle and a needle cap, wherein the needle handle is a puncture working part of the blood taking needle and generally consists of a handle part and a needle body, the needle body is fixed on the handle part, and the head part and the needle tip of the needle body are exposed out of one end of the handle part. The cap-twisting type blood taking needle cap and the needle handle are of an integrally formed structure, the needle cap is sleeved on the needle tip, and the needle cap is screwed off from the needle handle to expose the needle tip when in use. The needle cap of a cap-covered blood collection needle is generally sleeved on the needle handle. Both twist cap and cap types are suitable for use in the present invention.

2. In the above scheme, the "installation locking position" means that the needle handle of the blood taking needle is in a normal use position after being installed on the needle seat of the injection rod. In the position, the needle handle has two requirements relative to the needle seat, and the first requirement is that the needle handle is in a positioning and fixed state relative to the needle seat; secondly, the needle point on the needle handle is in a fixed position relative to a certain datum point on the needle base, so that the consistency of the puncture depth when the same type of blood taking needle is repeatedly used can be ensured.

3. In the scheme, the needle unloading pause position is a temporary pause position designed for solving the problem that the needle unloading pause is needed when the needle of the cap-free blood sampling pen is unloaded and the cap is convenient to prick.

4. In the above scheme, the "front end limit position" in the "stopping forward movement until the shooting rod is located at the front end limit position relative to the blood sampling pen" refers to that the shooting rod has a limit position for preventing the shooting rod from continuing to move forward in the forward movement process. This is true in every type of lancet, where the front end limit position, in addition to preventing the shoot rod from moving forward, also plays an important role in controlling the depth of blood collection (penetration depth). The blood sampling pen with the adjustable puncture depth changes the blood sampling depth (puncture depth) by adjusting the limit position of the front end in the axial direction of the blood sampling pen.

5. In the present invention, the meaning of "forward" in the terms of "forward", "front end" and "forward" means a direction pointed by a tip of a lancet pen or a direction pointed by a tip of a lancet. And the meaning of "back" in the back and rear end is the reverse of front. The axial direction refers to the axial direction of the blood sampling pen, and is also the radial direction of a connecting line between a pen point and a pen tail of the blood sampling pen, or the front-back direction. The term "radial" refers to a radial direction with reference to the axial direction.

6. In the above scheme, the arrangement modes of the first clamping groove, the second clamping groove and the clamping hook have the following two variation schemes:

the first variant: the first clamping groove and the second clamping groove are both arranged on the matching surface of the needle handle, and the clamping hook is arranged on the matching surface of the needle seat. The first clamping groove is positioned in front of the second clamping groove in the axial direction of the blood sampling pen. The top end of the first clamping surface is arranged on the cross section of the needle handle, the radial length based on the center point of the cross section is a first radial length, the top end of the second clamping surface is arranged on the cross section of the needle handle, the radial length based on the center point of the cross section is a second radial length, and the second radial length is greater than or less than the first radial length.

The second variant: the first clamping groove and the second clamping groove are both arranged on the matching surface of the needle base, and the clamping hook is arranged on the matching surface of the needle handle. The second clamping groove is positioned in front of the first clamping groove in the axial direction of the blood sampling pen. The top end of the first clamping surface is arranged on the cross section of the needle base, the radial distance taking the center point of the cross section as the reference is a first radial distance, the top end of the second clamping surface is arranged on the cross section of the needle base, the radial distance taking the center point of the cross section as the reference is a second radial distance, and the second radial distance is smaller than or larger than the first radial distance.

The design principle and the technical conception of the invention are as follows: in order to solve the problem that the cap is convenient to prick when the cap-removal-free blood sampling pen needs to be stopped when a needle is removed, a first clamping groove and a second clamping groove are arranged between sliding matching surfaces of a needle handle and a needle base, a clamping hook is arranged on one of the sliding matching surfaces, when the clamping hook is in clamping matching with the first clamping groove, the needle handle is in an installation locking position relative to the needle base, and when the clamping hook is in clamping matching with the second clamping groove, the needle handle is in a needle-removal stopping position relative to the needle base. In the needle unloading state, in the first stage, the needle unloading rod drives the needle handle and the shooting rod to integrally move forwards until the shooting rod moves to the front end limiting position, and then the shooting rod stops moving; in the second stage, the needle unloading rod is continuously pushed to force the clamping hook to be unhooked from the first clamping groove, the needle handle stops moving when moving forwards relative to the needle base to the needle unloading pause position, and the head and the needle point of the needle handle are exposed out of the front end of the blood sampling pen at the moment so as to facilitate cap pricking; in the third stage, the needle discharging rod is pushed continuously after the cap is pricked, so that the clamping hook is forced to be unhooked from the second clamping groove, and the needle handle is ejected out of the needle base.

Due to the application of the scheme, compared with the prior art, the invention has the following advantages and effects:

1. in the use of the blood sampling pen, needle removal is a conventional operation, but for a disposable blood sampling needle, a needle tip needs to be pricked into a needle cap after use so as to be discarded, so that other people are not pricked or cross infection is avoided, and the basic safety requirement of the use of the blood sampling pen is met. However, for the cap-removing type blood sampling pen, the pen cap needs to be removed when the needle is removed, the needle point can be directly observed, and the operation of inserting the needle cap is easy to implement. However, for the cap-removal-free blood sampling pen, since the pen cap is not required to be removed during needle removal, the head and the needle tip of the blood sampling needle cannot be directly observed, and inconvenience is brought to the operation of inserting the needle cap. The invention utilizes the position relationship of the needle handle and the needle base in the processes of needle mounting, needle dismounting and cap pricking, and a first clamping groove and a second clamping groove are arranged on one of the sliding matching surfaces of the needle handle and the needle base, and a clamping hook is arranged on the other one of the sliding matching surfaces. When the clamping hook is in clamping fit with the first clamping groove, the needle handle is in an installation locking position relative to the needle base, and when the clamping hook is in clamping fit with the second clamping groove, the needle handle is in a needle unloading stopping position relative to the needle base. The needle unloading stopping position is specially designed in the needle unloading process of the blood sampling pen, so that the needle unloading rod can obviously generate temporary stopping in the process of pushing the needle handle, the needle handle is designed to be separated from the original position in the needle base but not separated from the needle base in the temporary stopping process, and the needle tip is exposed from the blood sampling end face to facilitate the cap pricking operation. The temporary pause in the needle unloading process solves the problems of poor operation stability and inconvenient operation of needle unloading and pricking caps of cap-unloading-free blood sampling pens with better stability and reliability.

2. In the design of the needle discharging mechanism, the influence of the clamping amount of the clamping hook in clamping and matching with the first clamping groove and the second clamping groove on needle discharging pause is specially considered. When the clamping hook is clamped and matched with the first clamping groove, the needle handle is designed to be in an installation locking position relative to the needle base, and the radial projection length of the overlapping area of the hook surface and the first clamping surface on the cross section of the needle handle is defined as a first clamping amount in the installation locking position; meanwhile, when the clamping hook is clamped and matched with the second clamping groove, the needle handle is designed to be positioned at a needle unloading pause position relative to the needle base, and the radial projection length of the overlapping area of the hook surface and the second clamping surface on the cross section of the needle handle is defined as a second clamping amount at the needle unloading pause position; finally, the first amount of the card is required to be smaller or larger than the second amount of the card. Aiming at the problem that when one clamping hook is respectively clamped and matched with two clamping grooves (a first clamping groove and a second clamping groove), the front clamping amount and the rear clamping amount are different, the design is not only beneficial to the separation of a needle handle from a mounting and locking position in the needle discharging process, but also beneficial to the temporary and reliable stop of the needle handle in the needle discharging stopping position. The structure design is reasonable, the technical conception is unique and ingenious, and the method has prominent substantive characteristics and remarkable progress.

3. The invention has better process manufacturability and reliable work, and particularly, the first clamping groove and the second clamping groove are both arranged on the matching surface of the needle handle, and the clamping hook is arranged on the matching surface of the needle base, so that the realization of two different clamping amounts is easier. In a word, the invention further improves the needle-removing operation performance of the blood sampling pen and plays a positive role in the improvement and development of the blood sampling pen.

Drawings

FIG. 1 is a perspective view of a blood collection device according to an embodiment 1 of the present invention;

FIG. 2 is an exploded perspective view of the blood collection set of embodiment 1 of the present invention;

FIG. 3 is a schematic view of a needle-removing pause structure of the blood collecting device of embodiment 1 of the present invention;

FIG. 4 is a schematic diagram of a needle discharging pause structure of the embodiment 2 of the blood collecting device of the present invention;

FIG. 5 is a perspective view of a lancet of embodiment 1 of the lancing device according to the present invention;

FIG. 6 is a front view of a lancet of embodiment 1 of the lancing device according to the present invention;

FIG. 7 isbase:Sub>A cross-sectional view A-A of FIG. 6;

FIG. 8 is a front view of the handle of a lancet in accordance with embodiment 1 of the lancing device according to the present invention;

FIG. 9 is an enlarged view of B (first and second detents on the needle shaft) of FIG. 6;

FIG. 10 is an enlarged view of the needle cap head at C of FIG. 7;

FIG. 11 is a view showing the state after the needle handle is inserted into the needle cap;

FIG. 12 is a perspective view of a shooting rod of the blood collecting device 1 according to the present invention;

fig. 13 is an enlarged view of fig. 12 at D (the catch on the hub);

FIG. 14 is a perspective view of a blood drawing device in accordance with embodiment 1 of the present invention with a needle shaft inserted into a needle holder and in an installed and locked position;

FIG. 15 is an enlarged fragmentary view of FIG. 14;

FIG. 16 is a perspective view of the needle hub with the needle handle in a needle discharge pause position during needle discharge in accordance with embodiment 1 of the blood drawing device of the present invention;

FIG. 17 is a perspective view of the blood collection device of embodiment 1 of the present invention showing the needle shaft being ejected from the needle holder to be removed;

FIG. 18 is a view showing a state in which the lancet is directly pushed into the chamber after the lancet is inserted into the embodiment 1 of the blood collecting device according to the present invention;

FIG. 19 is a view showing a state in which a lancet cap is removed in the embodiment 1 of the blood collecting device of the present invention;

FIG. 20 is a view showing a state in which a button is pressed to eject blood in embodiment 1 of the blood collecting device of the present invention;

FIG. 21 is a view showing a needle-removing pause state in the embodiment 1 of the blood collecting device of the present invention;

FIG. 22 is a view showing a state that the needle is removed and stopped and then the cap is inserted in the embodiment 1 of the blood collecting device;

FIG. 23 is a view showing a state where the needle is detached from the blood collecting device in accordance with embodiment 1 of the present invention;

FIG. 24 is a state in which a lancet is freely released after the lancet is ejected from the lancet in the embodiment 1 of the blood collecting device according to the present invention;

FIG. 25 is an initial state diagram of an equivalent variation of the lancing device according to the present invention;

FIG. 26 is a view showing a needle-detaching state in an equivalent variation of the blood collecting device of the present invention;

FIG. 27 is a diagram showing an initial state of a second equivalent variation of the blood collection device of the present invention;

FIG. 28 is a needle-detaching state diagram of an equivalent variation of the blood sampling device of the present invention;

FIG. 29 is a view showing three initial states of an equivalent variation of the blood collecting device of the present invention;

FIG. 30 is a three-needle-removal state diagram of an equivalent variation of the blood collection device of the present invention.

In the above drawings: 1. a pen cap; 2. a middle sleeve; 3. a blood collection end face; 4. a blood collection needle; 5. a needle handle; 6. shooting a rod; 7. a needle cap; 8. a jacket; 9. an inner sleeve; 10. a tail handle; 11. unloading the needle rod; 12. a needle seat; 13. removing the needle action surface; 14. a first card slot; 15. a second card slot; 16. a hook; 17. a housing; 18. hooking the noodles; 19. a first engaging surface; 20. a second engaging surface; 21. a return spring; 22. a firing spring; 23. a button; 24. disassembling the needle push handle; 25. a bead ring; 26. and (4) reversing the ring.

Detailed Description

The invention is further described with reference to the following figures and examples:

example 1: a blood sampling device which is convenient for cap pricking during needle unloading pause (in the needle unloading pause structure, a first clamping groove 14 and a second clamping groove 15 are arranged on a needle handle 5, a clamping hook 16 is arranged on a needle base 12)

As shown in fig. 1 to 3, and 5 to 24, the blood collection device is composed of a disposable blood collection needle 4 and a disposable blood collection pen (see fig. 1), wherein the blood collection needle 4 is composed of a needle handle 5 and a needle cap 7 (see fig. 5 to 7).

The blood sampling pen consists of a pen cap 1, a middle sleeve 2, a shooting rod 6, a needle disassembling rod 11, a shell 17, a button 23, a launching spring 22, a return spring 21, an inner sleeve 9, an outer sleeve 8 and a needle disassembling push handle 24 (see figure 2). The pen cap 1, the middle sleeve 2 and the shell 17 are connected to form a shell, and an ejection cavity is formed in the shell. The inner sleeve 9 and the outer sleeve 8 are connected to form a tail handle 10 in the invention.

The pen cap 1 is a sleeve type cap of the head part of the blood sampling pen, and the front end of the pen cap 1 is provided with a blood sampling end face 3 (shown in figures 1 and 2) for contacting a blood sampling part of a human body. The middle sleeve 2 is a base body which is used for being connected and matched with the pen cap 1 at the front part of the blood sampling pen, the pen cap 1 is connected with the middle sleeve 2 in a matched mode through a connecting port (see fig. 2 and 18), and the pen cap 1 and the middle sleeve 2 form plug connection through the plug port. The shooting rod 6 is a launching part capable of mounting the blood taking needle 4, the shooting rod 6 is located in the launching cavity, the shooting rod 6 is in axial sliding fit with the casing in the blood taking pen, and an upper chamber locking and unlocking structure is arranged between the shooting rod 6 and the casing. In the present embodiment, the head of the shoot rod 6 is provided with a needle holder 12 (see fig. 12) for mounting the lancet 4 (fig. 14 and 15). The outer shell 17 is fixedly connected with the middle sleeve 2 (see fig. 18), but the outer shell 17 and the middle sleeve 2 can also be designed into an integral structure. The firing spring 22 is a spring that provides the motive force for lancing blood, and the firing spring 22 is located within an ejection chamber (see FIG. 18). The tail handle 10 is a handle (see fig. 18) arranged at the tail of the blood sampling pen and used for driving the shooting rod 6 to be loaded and adjusting the puncture depth, and the main body of the tail handle 10 is a sleeve structure (see fig. 2) which is in sliding connection with the shell in the axial direction of the blood sampling pen. In the present embodiment, the sleeve structure of the main body of the tail handle 10 is formed by fixedly connecting both the inner sleeve 9 and the outer sleeve 8 (see fig. 18). The return spring 21 is a spring that provides the return power for the tail handle 10, and the return spring 21 is located in the ejection chamber and acts in the return direction of the tail handle 10 (see fig. 18). The needle discharging rod 11 and the needle discharging push handle 24 are ejector rods (see fig. 17 and 18) used for discharging the blood taking needle 4 on the blood taking pen, the needle discharging rod 11 and the injection rod 6 are in sliding fit in the axial direction of the blood taking pen, a needle discharging action surface 13 (see fig. 17 and 18) is arranged on the needle discharging rod 11, and the needle discharging action surface 13 is used for pushing and discharging the needle handle 5 (see fig. 15) arranged on the needle base 12.

The innovation of the invention is described as follows:

between the sliding matching surfaces of the needle handle 5 and the needle base 12, one is provided with a first clamping groove 14 and a second clamping groove 15, the other is provided with a clamping hook 16, and the acting parts of the first clamping groove 14, the second clamping groove 15 and the clamping hook 16 are positioned on the same axial sliding path. Referring to fig. 3, in the present embodiment, the first locking groove 14 and the second locking groove 15 are both disposed on the mating surface of the needle handle 5 (see fig. 5, 6 and 9), and the hook 16 is disposed on the mating surface of the needle holder 12 (see fig. 12 and 13). The first locking groove 14 is located in front of the second locking groove 15 in the axial direction of the lancet (see fig. 9).

The hook 16 is provided with a hook surface 18 (see fig. 3 and 13) dedicated to engagement, a first engagement surface 19 (see fig. 3 and 9) in the first card slot 14 corresponding to the hook surface 18, and a second engagement surface 20 (see fig. 3 and 9) in the second card slot 15 corresponding to the hook surface 18.

When the hook 16 is in snap fit engagement with the first locking groove 14 (see fig. 14 and 15), the needle handle 5 is in an installation locking position relative to the needle holder 12, in which the radial projection length of the overlapping region of the hook surface 18 and the first engaging surface 19 on the cross section of the needle handle 5 is a first engaging amount.

When the hook 16 is in snap fit engagement with the second locking groove 15 (see fig. 16), the needle handle 5 is located at a needle-unloading stop position relative to the needle base 12, in which the radial projection length of the overlapping area of the hook surface 18 and the second locking surface 20 on the cross section of the needle handle 5 is a second locking amount.

The first engagement amount is smaller than the second engagement amount. Referring to fig. 3, in the present embodiment, the radial length of the top end of the first engaging surface 19 on the cross section of the needle shaft 5 with reference to the center point of the cross section is a first radial length, the radial length of the top end of the second engaging surface 20 on the cross section of the needle shaft 5 with reference to the center point of the cross section is a second radial length, and the second radial length is greater than the first radial length (see the upper edge of fig. 9).

In the cross-section of the hook 16, the hook surface 18 is oblique (see fig. 13). In the cross section of the first card slot 14, the first engaging surface 19 is oblique (see fig. 9). The second engaging surface 20 is oblique in the cross section of the second engaging groove 15 (see fig. 9).

in the first stage, the needle discharging rod 11 is pushed manually, the needle discharging acting surface 13 on the needle discharging rod 11 acts on the needle handle 5, and the needle handle 5 is in the installation locking position relative to the needle base 12, the clamping hook 16 is in clamping fit with the first clamping groove 14 (see fig. 15), so that the needle handle 5 and the shooting rod 6 are driven to integrally move forwards until the shooting rod 6 stops moving forwards when being in the front end limiting position relative to the blood sampling pen.

And in the second stage, the needle discharging rod 11 is continuously pushed, the shooting rod 6 cannot continuously move forwards due to the limit position of the front end, so that the clamping hook 16 is forced to be unhooked from the first clamping groove 14, the needle discharging rod 11 pushes the needle handle 5 to move forwards on the needle base 12 after unhooking, when the needle handle 5 moves to be in a needle discharging pause position relative to the needle base 12, the clamping hook 16 is in clamping fit with the second clamping groove 15, meanwhile, the needle handle 5 stops moving forwards on the needle base 12 (see fig. 16), at the moment, the needle handle 5 moves forwards on the needle base 12 for a distance from the installation locking position, and the head and the needle tip of the needle handle 5 are exposed from the front end of the blood sampling pen to facilitate cap pricking.

In the third stage, the needle discharging rod 11 is pushed continuously after the cap is pricked, and the shooting rod 6 cannot move continuously because of being in the front limit position, so that the clamping hook 16 is forced to be unhooked from the second clamping groove 15 (see fig. 17), and the needle handle 5 is ejected out of the needle seat 12 by the needle discharging action surface 13 on the needle discharging rod 11 after the unhooking.

In order to better understand the relative positions and relationships between the components of the blood collection device, the blood collection device of the present invention is described below with reference to the use state:

1. loading state of needle

FIG. 18 is a view showing a state in which the lancet is directly pushed to the upper part of the lancet after the lancet is loaded in the embodiment 1 of the lancet device according to the present invention. Because the needle outlet hole at the front end of the pen cap 1 is designed to be a big hole, the blood taking needle 4 is directly inserted into the needle base 12 through the big hole at the front end, the pen cap 1 does not need to be dismounted during needle installation, the blood taking needle 4 can be directly inserted from the blood taking port of the pen cap 1, and the tail end face of the blood taking needle 4 is propped against the needle dismounting action surface 13 at the front end of the needle dismounting rod 11. The blood taking needle 4 is continuously inserted, the needle unloading rod 11 and the needle unloading push handle 24 are pushed to move backwards until the shooting rod 6 is loaded and locked, the blood taking needle 4 is clamped and fixed by the needle base 12, at the moment, the clamping hook 16 is in clamping fit with the first clamping groove 14, and the needle handle 5 is in an installation and locking position relative to the needle base 12.

2. State of removing protective cap

FIG. 19 is a view showing a state in which a lancet cap is removed in the embodiment 1 of the blood collecting device of the present invention. As can be seen in figure 19, the needle cap 7 on the lancet 4 is twisted off.

3. Emission blood sampling state

FIG. 20 is a view showing a state in which a button is pressed to eject blood in embodiment 1 of the blood collecting device of the present invention. In this state, the button 23 is pressed to force the shooting rod 6 to unhook, the firing spring 22 pushes the shooting rod 6 and the needle handle 5 to move forward, the shooting rod 6 and the needle handle 5 compress the return spring 21 firstly during the forward movement and the firing process, and then the needle handle 5 fires the puncture.

4. Needle-removing pause state

FIG. 21 is a view showing a needle-removing stoppage state in the blood collecting apparatus according to the embodiment 1 of the present invention. As can be seen from fig. 21, when the needle discharging rod 11 is pushed manually (see the arrow in fig. 21), the needle discharging acting surface 13 on the needle discharging rod 11 acts on the needle handle 5, and since the needle handle 5 is in the installation and locking position relative to the needle base 12, the hook 16 is in snap fit with the first slot 14, so as to drive the needle handle 5 and the shooting rod 6 to move forward integrally until the shooting rod 6 stops moving forward when being in the front limit position relative to the lancet (in this embodiment, the front limit position of the shooting rod 6 is generated by the contact of the end surface of the tail of the shooting rod 6 and the end surface of the inner sleeve 9). The needle discharging rod 11 is pushed continuously to force the clamping hook 16 to be unhooked from the first clamping groove 14, the needle discharging rod 11 pushes the needle handle 5 to move forwards on the needle base 12 after unhooking, when the needle handle 5 moves to be in a needle discharging pause position relative to the needle base 12, the clamping hook 16 is in clamping fit with the second clamping groove 15 due to the fact that the first clamping amount is smaller than the second clamping amount, meanwhile, the needle handle 5 moves forwards on the needle base 12 to pause, at the moment, the needle handle 5 moves forwards on the needle base 12 away from the installation locking position by a certain distance, and the head and the needle tip of the needle handle 5 are exposed from the front end of the blood sampling pen to facilitate cap pricking.

5. The state of cap insertion after needle removal and pause

FIG. 22 is a view showing a state that the needle is stopped being removed and then the cap is inserted in the embodiment 1 of the blood collecting device of the present invention. As can be seen from FIG. 22, after the needle-off pause occurs, the needle handle 5 can be easily inserted into the concave hole of the needle cap 7 by holding the blood sampling pen by hand, at this time, the convex rib ring 25 at the head of the needle handle 5 is clamped into the inverted ring 26 of the needle cap 7, and the needle handle 5 is fastened on the needle cap 7 due to mutual interference.

6. Needle-detaching off state

FIG. 23 is a view showing a state where a needle is detached from the blood collecting device according to embodiment 1 of the present invention. As can be seen from fig. 23, the needle discharging rod 11 is pushed further after the cap is pricked, and the shooting rod 6 is located at the front limit position and cannot move further forward, so that the hook 16 is forced to be unhooked from the second clamping groove 15.

7. Free falling state of blood taking needle

FIG. 24 shows a state in which a lancet is ejected and a lancet is freely detached in accordance with a lancet in embodiment 1 of the blood collecting device of the present invention. As can be seen from fig. 24, after the hook 16 is unhooked from the second locking groove 15, the needle handle 5 is ejected from the needle holder 12 by the needle-removing action surface 13 on the needle-removing rod 11 and is free to fall off.

Example 2: a blood sampling device convenient for cap pricking during needle unloading pause (in the needle unloading pause structure, a first clamping groove 14 and a second clamping groove 15 are arranged on a needle base 12, a clamping hook 16 is arranged on a needle handle 5)

Example 2 differs from example 1 in that: the positions of the first and second locking grooves and the hooks are exchanged, and specifically, as shown in fig. 4, the first and second locking

grooves

14 and 15 are both disposed on the mating surface of the needle holder 12, and the hooks 16 are disposed on the mating surface of the needle handle 5. The second locking groove 15 is located in front of the first locking groove 14 in the axial direction of the lancet. The top end of the first engaging surface 19 is on the cross section of the needle base 12, the radial distance with the center point of the cross section as the reference is the first radial distance, the top end of the second engaging surface 20 is on the cross section of the needle base 12, the radial distance with the center point of the cross section as the reference is the second radial distance, and the second radial distance is smaller than the first radial distance.

The rest is the same as in embodiment 1, and the description will not be repeated here.

With respect to the above embodiments, possible variations of the present invention are described below:

1. in the above embodiment 1, a specific structure form is given in which the first locking groove 14 and the second locking groove 15 are provided on the needle handle 5, and the locking hook 16 is provided on the needle holder 12 in the needle discharging pause structure. However, the present invention is not limited to this, and the following three equivalent variations can be made with respect to the first card slot 14, the second card slot 15 and the hook 16:

equivalent variant one: referring to FIGS. 25 and 26, wherein FIG. 25 is a view showing an initial state of an equivalent variation of the lancing device according to the present invention; FIG. 26 is a view showing a needle removing state in an equivalent variation of the blood sampling device of the present invention. As can be seen from this equivalent variation, the hook 16 is the same as in embodiment 1, and is unchanged. While first card slot 14 and second card slot 15 vary and the variations are: the body of the needle shaft 5 adjacent between the first and

second card slots

14, 15 is cut away. Such variations are substantially equivalent in function and effect and are within the spirit and substance of the invention.

Equivalent variation scheme two: referring to fig. 27 and 28, wherein fig. 27 is a view showing an initial state of an equivalent variation of the lancing device according to the present invention; FIG. 28 is a view showing a state of needle removal in accordance with an equivalent variation of the blood collection device of the present invention. It can be seen from this equivalent variation that the hook 16 is changed from one to two in embodiment 1. And the first card slot 14 and the second card slot 15 are changed in that: the needle shaft 5 adjacent between the first and

second card slots

14 and 15 is physically cut away. Such variations are substantially equivalent in function and effect and are within the spirit and substance of the invention.

Equivalent variation scheme three: referring to fig. 29 and 30, wherein fig. 29 shows three initial state views of an equivalent variation of the lancing device according to the present invention; FIG. 30 is a three-needle-removal state diagram showing an equivalent variation of the blood collection device of the present invention. As can be seen from this equivalent variation, the hook 16 is the same as in embodiment 1, and is unchanged. While first card slot 14 and second card slot 15 vary and the variations are: the first and second catching

grooves

14 and 15 become a small groove provided at the front and a large groove provided at the rear on the needle shaft 5. Such variations are substantially equivalent in function and effect, and are within the spirit and substance of the invention.

2. In the above embodiment, the hook surface 18 is inclined in the cross section of the hook 16. The first engaging surface 19 is inclined in the cross section of the first engaging groove 14. The second engaging surface 20 is inclined in the cross section of the second engaging groove 15. The present invention is not limited thereto and the hook surface 18 may be a diagonal line, a straight line, an arc line, or a combination of at least two thereof; the first engaging surface 19 may be a slant line, a straight line, an arc line, or a combination of at least two thereof; the second engagement surface 20 may be slanted, straight, curved, or a combination of at least two of the same.

3. In the above embodiment, the first engaging amount is smaller than the second engaging amount. However, the present invention is not limited to this, and the first engagement amount may be larger than the second engagement amount. For the embodiment 1 in which the first locking groove 14 and the second locking groove 15 are provided on the needle handle 5 and the locking hook 16 is provided on the needle holder 12 in the needle-removing pause structure, it can also be said that the second radial length is smaller than the first radial length. For the embodiment 2 in which the first catch 14 and the second catch 15 are provided on the needle holder 12 and the catch 16 is provided on the needle handle 5 in the needle withdrawal pause configuration, it can also be said that the second radial distance is greater than the first radial distance. As would be understood and accepted by those skilled in the art. In short, as long as the first clamping amount is different from the second clamping amount, the hand feeling difference between the installation locking position and the needle unloading stopping position can be obviously recognized.

4. In the above embodiment, the needle discharging rod 11 and the needle discharging push handle 24 constitute a tail needle discharging structure. The invention is not limited to the structure, and the needle unloading pause structure is also suitable for the blood sampling pen with the side needle unloading structure. As would be understood and accepted by those skilled in the art.

5. In the above embodiments, the contents of the present invention are described by taking a cap-removal-free needle-type blood sampling pen as an example. However, the invention is not limited to the structure, and the needle-dismounting pause structure can also be used for the needle-dismounting blood sampling pen. As would be understood and accepted by those skilled in the art.

6. In the above embodiment, the cap 1 is located at the front of the housing 17 and is detachably and fixedly connected with the housing 17 (see fig. 18). However, the invention is not limited to this, the pen cap 1 and the casing 17 may be designed as an integral structure, the needle outlet hole at the front end of the pen cap 1 is designed as a large hole, the blood taking needle 4 can be directly inserted into the needle base 12 through the large hole at the front end, and the blood taking needle 4 can be directly removed from the large hole at the front end during needle removal. The design can avoid the action of disassembling the pen cap 1 during needle installation and simplify the operation. The other situation is that the pen cap 1 is positioned at the front part of the shell 17 and is detachably and fixedly connected with the shell 17, but a pinhole at the front end of the pen cap 1 is designed to be a small hole, when a needle is installed, the pen cap 1 needs to be firstly detached, and then the blood taking needle 4 is inserted on the needle base 12.

7. In the above embodiment, the puncturing depth adjusting mechanism is formed by the active impacting surface at the rear part of the shooting rod 6 and the passive impacting surface arranged on the sleeve (inner sleeve 9) structure of the tail handle 10, wherein the passive impacting surface is a spiral step surface or a spiral surface or an inclined surface which is arranged on the sleeve (inner sleeve 9) structure of the tail handle 10 and faces the rear part of the blood sampling pen. The invention is not influenced by the change of the puncture depth adjusting mechanism.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A blood sampling device which is convenient for cap pricking during needle unloading and pausing consists of a disposable blood sampling needle (4) and a matched reusable blood sampling pen thereof;

the blood taking needle (4) consists of a needle handle (5) and a needle cap (7);

the blood sampling pen comprises a shooting rod (6) and a needle unloading rod (11); the ejection rod (6) is an ejection part of the blood sampling pen and is arranged in an ejection cavity of the blood sampling pen, and the head part of the ejection rod (6) is provided with a needle seat (12) for inserting a needle handle (5) of the blood sampling pen (4); the needle unloading rod (11) is a needle unloading part of the blood sampling pen, the needle unloading rod (11) is in axial sliding fit relative to the shooting rod (6), a needle unloading action surface (13) is arranged on the needle unloading rod (11), and the needle unloading action surface (13) is used for pushing and unloading a needle handle (5) arranged on a needle base (12);

the method is characterized in that: a first clamping groove (14) and a second clamping groove (15) are arranged on one of the needle handle (5) and the needle base (12) between the sliding matching surfaces, a clamping hook (16) is arranged on the other of the needle handle and the needle base, and the action parts of the first clamping groove (14), the second clamping groove (15) and the clamping hook (16) are positioned on the same axial sliding path;

the hook (16) is provided with a hook surface (18) specially used for clamping, a first clamping surface (19) is arranged in the first clamping groove (14) corresponding to the hook surface (18), and a second clamping surface (20) is arranged in the second clamping groove (15) corresponding to the hook surface (18);

when the clamping hook (16) is in clamping fit with the first clamping groove (14), the needle handle (5) is in an installation locking position relative to the needle base (12), and in the installation locking position, the radial projection length of the overlapping area of the hook surface (18) and the first clamping surface (19) on the cross section of the needle handle (5) is a first clamping amount;

when the clamping hook (16) is clamped and matched with the second clamping groove (15), the needle handle (5) is located at a needle unloading pause position relative to the needle base (12), and the radial projection length of the overlapping area of the hook surface (18) and the second clamping surface (20) on the cross section of the needle handle (5) at the needle unloading pause position is a second clamping amount;

the first clamping amount is smaller than or larger than the second clamping amount;

in the first stage, a needle unloading rod (11) is pushed manually, a needle unloading action surface (13) on the needle unloading rod (11) acts on a needle handle (5), and as the needle handle (5) is in an installation locking position relative to a needle base (12), a clamping hook (16) is in clamping fit with a first clamping groove (14), the needle handle (5) and a shooting rod (6) are driven to integrally move forwards until the shooting rod (6) is in a front end limiting position relative to a blood sampling pen and stops moving forwards;

in the second stage, the needle discharging rod (11) is continuously pushed, the shooting rod (6) is positioned at the front end limiting position and cannot continuously move forwards, so that the clamping hook (16) is forced to be unhooked from the first clamping groove (14), the needle discharging rod (11) pushes the needle handle (5) to move forwards on the needle base (12) after unhooking, when the needle handle (5) moves to be positioned at a needle discharging pause position relative to the needle base (12), the clamping hook (16) is clamped and matched with the second clamping groove (15), meanwhile, the needle handle (5) moves forwards on the needle base (12) to pause, the needle handle (5) moves forwards on the needle base (12) away from the installation locking position for a certain distance at the moment, and the head and the needle tip of the needle handle (5) are exposed out of the front end of the blood sampling pen so as to facilitate cap pricking;

and in the third stage, the needle discharging rod (11) is pushed continuously after the cap is pricked, and the shooting rod (6) cannot move forwards continuously because of being positioned at the front end limiting position, so that the clamping hook (16) is forced to be unhooked from the second clamping groove (15), and the unhooked needle handle (5) is ejected out of the needle base (12) by the needle discharging action surface (13) on the needle discharging rod (11).

2. The lancing device according to claim 1, wherein: the first clamping groove (14) and the second clamping groove (15) are arranged on the matching surface of the needle handle (5), and the clamping hook (16) is arranged on the matching surface of the needle base (12).

3. The lancing device according to claim 2, wherein: the first clamping groove (14) is positioned in front of the second clamping groove (15) in the axial direction of the blood sampling pen.

4. The lancing device according to claim 2 or 3, wherein: the top end of the first clamping surface (19) is arranged on the cross section of the needle handle (5), the radial length taking the center point of the cross section as the reference is the first radial length, the top end of the second clamping surface (20) is arranged on the cross section of the needle handle (5), the radial length taking the center point of the cross section as the reference is the second radial length, and the second radial length is greater than or less than the first radial length.

5. The lancing device according to claim 4, wherein: on the cross section of the hook (16), a hook surface (18) is oblique line, straight line, arc line or at least two combinations thereof; on the cross section of the first clamping groove (14), the first clamping surface (19) is in a slant line, a straight line, an arc line or at least two combinations thereof; on the cross section of the second clamping groove (15), the second clamping surface (20) is oblique line, straight line, arc line or at least two combinations thereof.

6. The lancing device according to claim 1, wherein: the first clamping groove (14) and the second clamping groove (15) are arranged on the matching surface of the needle base (12), and the clamping hook (16) is arranged on the matching surface of the needle handle (5).

7. The lancing device according to claim 6, wherein: the second clamping groove (15) is positioned in front of the first clamping groove (14) in the axial direction of the blood sampling pen.

8. The lancing device according to claim 6 or 7, wherein: the top end of the first clamping surface (19) is arranged on the cross section of the needle seat (12), the radial distance taking the center point of the cross section as the reference is a first radial distance, the top end of the second clamping surface (20) is arranged on the cross section of the needle seat (12), the radial distance taking the center point of the cross section as the reference is a second radial distance, and the second radial distance is smaller than or larger than the first radial distance.

9. The lancing device according to claim 8, wherein: on the cross section of the hook (16), a hook surface (18) is oblique line, straight line, arc line or at least two combinations thereof; on the cross section of the first clamping groove (14), the first clamping surface (19) is in a slant line, a straight line, an arc line or at least two combinations thereof; on the cross section of the second clamping groove (15), the second clamping surface (20) is in a diagonal line, a straight line, an arc line or at least two combinations thereof.